21. In the case of a differentially rotating disk , the shear force can provide an additional stabilizing force. 22. After separation, centrifugal force due to the rotating disk throws particles against the inner walls of the filter. 23. The gas, however, contracted, causing the galaxy to rotate faster, until the result was a thin, rotating disk . 24. This is a three dimensional Riemannian manifold often loosely described as giving the noneuclidean geometry of a rotating disk . 25. In 1903, Alfred Wehrsen patented an ebonite rotating disk possessing embedded sectors with button contacts at the disk surface. 26. The rest of the cloud collapses into a rotating disk , in which matter gathers into asteroid-like rocks called planetesimals. 27. Collisions between streams from this stellar wind creates a shock front, with cooling particles settling toward a co-rotating disk . 28. Synchronisation around the circumference of a rotating disk gives a non vanishing time difference that depends on the direction used. 29. Optical storage systems work by reflecting beams of laser light off of a rotating disk with a minutely pitted surface. 30. There, a half-century ago, IBM began research that would lead to the first rotating disk system for storing computer data.
